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G. M. DAVIS.

I Steam Gage.

Nq'. 68,849. Patented Sept. 17, 1867.

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GEORGE M. DAVIS, 0F CHIC-AGO, ILLINOIS.

Letters Patent N 68,849, dated September 17, 1867. i i

IMPROVEMENT IN STEAM-GAUGES.

TO ALL WHOM Ill MAY CONCERN:

Be it known that I, GEORGE M. DAVIs, of Chicago, in the county of Cook,in the State of Illinois, have invented a new and improved constructionof Steam-Gauges; and I do hereby declare that the following is a fullandexact description thereof, reference being had to the accompanyingdrawings, and to the letters of reference marked thereon, and anadditional drawing, which I dcnomlnatc B, inwhich- Figure 1 is a planview of my invention, with the dial plate removed and a part of thediaphragm broken away to give a viewof the common flexible plate againstwhich the steam is made to press.

Figure 2, a plan view-of the inner side of the diaphragm, showing thebearings which hold the flexible plate and its packing in place.-

Figure 3, an elevation of'the diaphragm and its attachments removed fromthe gauge-box.

Figure 4, drawing B, is a sectional elevation, taken through fig. 1, atthe lineX X.

Figure 5, same drawing, is an elevation of the lever and bar, whichoperate the ratchet and indicating post.

The nature ofmy invention consists in the means for holding the flexibleplate to the projections, raised up to form a steam-chamber at the backof the diaphragm. By this means the diaphragm which supports the movingdevices is made to press closely against the flexible plate and thusmake the steam-chamber tight, and yet so'that it can be readily removedfor cleaning, repairs, Etc.

Your petitioner is well aware that there are difi'ereutly-consti'uctedsteam'gauges, but one of the advantages of this improvement is, that itis all on one'foundation or plate, so as to be taken out and replacedwithout any inconvenience; and after it is once constructed there isnothing that can get out of line or out of place.

Other steam-gauges are generally made in separate parts. The movementsbeing in different pieces, it is impossible to 'takc them out and putthem back again in their proper places without great inconvenience and'ditliculty. Owing to their peculiar construction they are more liableto get out of repairs; whilst this comhination, all being unitedtogether, it cannot in any manner become disarranged.

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction and operation.

K represents the back, and L the periphery of the common stealmgnugebox. M M represent an elevated rim, of sufiicient height to form asteam-chamber, between back K and flexible plate N G,'fig. 4; saidchamber being supplied with steam by means of pipe Q, in the usualmanner. The diaphragm A has two rims or pro jections P P, correspondingin diameter with the inner and outer periphery of projection M M. A ringof rubber, O, is fitted beneath plate N, and firmly clamped togetherwith said plate between projections P P M M, by means of screws 1, figs.1 and 4. The devices BD G U are attached wholly todiaphragm A, and aremade to operate by pressure of steam against plate N in the usualmanner. he dial and indicator are not shown in the drawings, they beinga common arrangement and well understood; the object of my inventionbeing more especially calculated for holding and removing the gearingandsimplit'ying the construction of the steam-chamber than improving theworking parts of the gaugqaltbough they are arranged in a betterposition than heretofore.

Having thus fully described my device, what I claim, and desire tosecure by Letters Patent, is- The diaphragm A, arranged to support thedevices D B C U, and having rims P P for clamping plate to projection'MM, on back K, substantially as and for the purposes set forth.

GEO. M. DAVIS,

bVitn esses D. H. HAMMER, HENRY S. Dow.

